问题 解答题
解方程
①X÷0.05=3.528②2X-4×6=80③4×4.5-3X=6.38
④4X-7.2=10⑤11.5X+X=20⑥3.8×12+15X=87.6.
答案

①X÷0.05=3.528,

X÷0.05×0.05=3.528×0.05,

X=0.1764;

②2X-4×6=80,

2X-24=80,

2X-24+24=80+24,

2X=104,

2X÷2=104÷2,

X=52;

③4×4.5-3X=6.38,

18-3X=6.38,

18-3X+3X=6.38+3X,

6.38+3X=18,

6.38+3X-6.38=18-6.38,

3X=11.62,

3X÷3=11.62÷3,

X=

581
150

④4X-7.2=10,

4X-7.2+7.2=10+7.2,

4X=17.2,

4X÷4=17.2÷4,

X=4.3;

⑤11.5X+X=20,

12.5X=20,

12.5X÷12.5=20÷12.5,

X=1.6;

⑥3.8×12+15X=87.6,

45.6+15X=87.6,

45.6+15X-45.6=87.6-45.6,

15X=42,

15X÷15=42÷15,

X=2.8.

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